Proxy Server Notes

1. Proxy Server is between the Internet and the intranet computer, its function is to replace the intranet computer to access the Internet information. Multiple intranet computers can access the Internet through the same extranet IP;

2. The working process of the proxy server:

(1) the client host sends a request to the proxy server to access the Internet;

(2) after receiving the request, the proxy server checks the "source address" and "Destination address", and if so, proceed to the next step, otherwise, refuse;

(3) The proxy server looks for the local cache first, and if the query data exists, it is returned directly to the client host and ends the processing; otherwise, go to the next step;

(4) the proxy server makes a request to the corresponding server;

(5) The Internet server returns the data requested by the proxy server, and after receiving the data, the proxy server copies a copy of the local cache on the one hand, and returns the result to the client host, and ends the processing;

Proxy Server Notes